I installed the main switch with the line traveler and ground in normal locations the neutral going into the load and a jumper between the load and neutral. The add on has the neutral traveler and ground wired normally with the other line wire being dead headed.

I’m not exactly sure what you are doing above. What I do know is that can fry your switch by jumping connections. Install you smart switch in the box with load. And follow the line-switch-load-switch-1 wiring diagram. You will not need the neutral or line wires that already exist in the add-on box. You can just cap each of them off.

Obviously I’m only guessing your configuration from what you said above. Pictures or diagrams would be helpful.

After I diagrammed it out I am not sure that I have a true “neutral” in either box. I diagrammed out how the circuit must work it appears that each box has a line, load, traveler and ground. I will try to offer the most info I can and a drawing.

There are 4 wires red, black, white and bare. The bare is clearly a ground.I have the following potential differences between the following:

Black, white or ground to red=0V

Black/ground=120V
White/ground=7v
Black/white~105V

From this I conclude that black is from the breaker. Red is purely a traveler. What I thought was a neutral is actually the load. Thus both boxes have line, load, ground, and traveler.

Could you take some photos of your boxes. Normally every wire at least comes in pairs (plus ground). Your diagram shows many single wires going between boxes. I’m not truly sure what the actual wiring is.

NOTE: Yes that is packaging tape. I didnt have electrical, couldn’t reinstall the switches because my wife started prying them apart and the blizzard prevented us from getting others/etape. Unfortunately the breaker for this light controls the entire upstairs.

If anyone has some comments or corrections, please let me know. I will try to continue to add other wiring configurations that pop up

Love referring people to this FAQ, great job!

In the final option that doesn’t have neutrals running down to the light switches I would like to suggest another solution using the new Aeotec Nano Dimmer This would be installed up in the light fixture gang box. The Nano updates the older Micro Dimmer G2 which is slightly larger but would also work that @TN_Oldman suggests and I agree with Don that I also like the Enerwave version because of it’s pigtails make it easy to install.

Thanks![quote=“jhamstead, post:1, topic:74962”]
line-switch-load-load-switch
[/quote]
. Your diagrams were super.
Well after checking the lights, they all have black and whites already separated.
I have power to the main (line) switch, blue light is lit, but can’t get the Add-on to work.
The white going to the second switch “line” has no current in any switch configuration.
With the Main switch “off” the Red traveler is hot at the second switch. With the Main switch “on” the other switch has NO current. (ie in two configurations there is NO current at all going to the second switch, so I obviously need a neutral run) If I switch the Main “on” the second switch has no current, with the Main “on” and the seconds switch “on” the Black traveler is hot. Color me totally confused…lol I do have the option of running wires to the light, I juts don’t know how to run the traveler…black is cold traveler on Main switch, but becomes hot on second switch when it is flipped?
So looks like I have Power to light. I do have the option of fairly easily running a new wire to light, but I need to isolate the traveler.
Well after crawling around in the attic, trying to trace wires and boxes I gave up. Switched to using Lutron Caseta with remote Kit (with bridge), $70 new on ebay. Should have done this first…and saved me a lot of time and energy. FYI: If you go Lutron you need the bridge.

I’m quite perplexed about my setup.
I can’t see the lights’ wiring because they’re in the ceiling but the boxes looke exactly like “3 way switch multiple lights between switches #1” and I wired my smart switches to match the diagram below that - the neutral lines have power but nothing else ever does.
ONE of the lights in my ceiling is now lit - permanently - none of the others light at all.
wth.
going to put it all back the way it was for now but any tips are appreciated.

okay, this is…weird.
if I put the black wire in on the “remote” switch it all works…
but - one light stays on all the time. I even tried unscrewing that bulb…what I assume is the next one in the series comes one instead until I put the first one back in…